Blow-blast gas burner



March 6, 1928.

H. V. DEEMAR BLOW BLAST GAS BURNER.

Filed Jan. 22. 1927 INVENTOR v flkfieemaf.

m ATTORNEYS Patented Mar. 6, 1928.

UNITED STATES 15661 929 Tan orr ca.

HENRY V. DEEMAR, OF ST. LOUIS, MISSOURI, ASS IGNOR- OF ONE-HALF TO HERBERT H.

DEEMAR, OE LOS ANGELES, CALIFORNIA.

BLOW BLAST GAS BURNER.

Application filed January 22, 1927. Serial No. 162,889.

This invention relates to gas burners of the blow blast type for house heating systems, bake ovens, and the like.

A primary object of the invention is to provide a burner of this character in which the air mixer is so constructed as to exert a powerful control'over the flame and in addition to create an intense heat it eliminates practically all noises of the flame as well as back firing. I

Another objectis to so construct a mixer as to supply a maximum amount of air and produce a more perfect mixture and which will aid the blower in that 1t, requlres a minimum amount of electrical energy to supply a certain quantity of air at a given place.

Another object of the invention is to pro vide a burner of this character having flame tubes constructed so that they will not rob one another of the air and gas mixture when a high air pressure is desirable to produce a hotter flame.

In carrying out these objects, the invention is susceptible of a wide range of modiflcation without departing from the spirit or sacrificing any of the advantages of the claimed invention; there being shown in the drawings for illustrative purposes certain preferred and practical forms, in which Figure 1 represents a top plan View of a burner constructed in accordance with this invention,

Figure 2 is a side elevation, partly in lon gitudinal section,

Figure 3 is an enlarged detail longitudinal vertical section through a portion of the flame tube member, and

Figure 4 is an enlarged transverse section through one of the flame tubes. In the embodiment illustrated the burner proper or flame tube member 1 is shown in the form of a rectangular casing, although obviously it may be of any desired configuration. plurality of series of flame tubes 10 any desired number of which may be provided, each tube being of the same construction which will hereinafter be more fully described.

The casing 1 is divided by a horizontal partition 2 into the compartments or chambers 3 and 4, chamber 3 being designed to supply air and gas and chamber 1 air alone to the flame tube 10. Each tube 10 comprises into pipe 20.

This casing 1 is equipped with a three tubes nested together and spaced radially apart, the larger outer tube being numbered 11 and extended above the other two, which are numbered 14: and 15. The

middle tube 14 extends above the inner tube 15 and is fixed to the top of the casing 1 While tube 15 extends into said casing and flares at its lower end as shown at 16, where it opens through the top wall of chamber 4 to admit air from said chamber to the tubes '10. The outer tube 11 is also mounted on the top of casingl around tube'ld and has inlet pipe 20 oflset upwardly from the main 1 air pipe 25. The pipe 25 is'connected with the air blower nozzle 26 being preferably,

integral therewith. Thepipe 25 discharges into the air supply chamber 4'. of casing 1 from which the air is sucked up through pipes 15 ot the flame tubes 10. I

A cut ofl"- valve 21 is located in pipe 20 for controlling the air supplied from the blower to chamberB and a deflector 22 is located on the front wall of said pipe at its junction with pipe-25 to directthe air A gas supply pipe 23 extends into pipe 19 through its top Wall and has a right angular reduced extension24 arranged longitudinally 1n sald pipe 19 opening toward chamber 18 (see Fig. 2). A cut off valve 27 is provided in pipe 23 to control the ply of gas to chamber 3.

After connecting the nozzle 26 with the blower, not shown, and the pipe 23 with gas supply, not shown, the burner is ready to operate. The blower being started forces the air through pipes 20 and 25 into the chambers 3 and 4, respectively. The air from chamber a is forced up through the group of small inner tubes 15 and expands at the ends of these tubes and draws up supwith it through pipes '14: the air and gas mixture from chamber 3. At the ends of tubes 14; this mixture expands and draws up through tubes 11 the air admitted through the openings 12, the shutters 13 controlling the air so supplied.

Under a high air pressure, the suction created at the top of tubes ll exerts more suction on the tubes 11 and less on tubes 14. The higher or longer the tubes 11 the less suction force is exerted on tubes 14 and the more on tubes 11. The lower or shorter the tubes 15 the greater the suction exerted on tubes it and the less on tubes ll. It is, of course, understood that the openings 12 with the shutters 13 provide ventilation Which releases the suction force when transferred from tubes 14 to 11.. lVhile these vent holes 12 release the suction described above they also furnish additional air to the flame.

The arrangement of the air pipe 20 provides a better mixture and assists the blower in that it does not require as much energy to supply the same quantity of air ata given place through one fourth mch pipe such as that shown at 20 851i) does through a certain group of one eighth inch pipes. This conalso eliminates back tiring. Pipe struction shown open around pipe 20 may 19 While I be closed if desired since the burner operates equally well either Way.

By enlarging the inner tube 150tthe flame tube the flame noise is lessened as also the blower. It will thus be seen that practically all of the noises are eliminated, producing a noiseless blow blast gas burner. This elimination of the noises is accomplished Without lessening the efliciency of the flame, and in lessening such noises, the pressure from the blower is correspondingly lessened which reduces the electrical energy and consequentlyalso reduces the cost of. operation.

Without further descriptionit is thought that the features and advantages of the in \ention will be readily apparent to those skilled in the art, and it will of course, be understood that changes in the form, proportion and minor details of construction may be resorted to, without departing from the spirit of the invention or its scope as claimed.

I claim 1. A flame tube for a blow blast gas burner comprising aninner, an outer and an intermediate tube arranged concentrically in spaced relation, the outer tube being longer than the intermediate tube, and the inter mediate tube longer than the inner tube whereby the fuel is expanded at the end of the tube from which it is discharged and thereby operates to draw 'l'uel up through the tube into which it discharges, the lower ends of the inner tubes having depending flared extensions, means for forcing air into said tubes through said extensions. and means for supplying an air and gas mixture to the intermediate tubes.

9.. A flame tube for a blow blast gaslntrner comprising an inner, an outer and an intermediate tube arranged concentrically in spaced relation, the outer tube being hunger than the intermediate tube, and the intermediate tube longer than the inner tube whereby the fuel is expanded at the end of the tube from which it is dis rhargcdand thereby operates to draw fuel up through the tube into Which it dis charges, the lower ends of the inner tubes having depending flared extensions, means for forcing air into said tubes through said extensions, and means for supplying an air and gas mixture to the intcrn'iediate tubes, and means for supplying and controllingthe amount of air supplied to the outer tubes.

HENRY V. DlfiljlMAl-t. 

